APA (7th ed.) Citation

Walnum, C. (1999). Visual Basic 6 master reference. IDG Books Worldwide.

Chicago Style (17th ed.) Citation

Walnum, Clayton. Visual Basic 6 Master Reference. Foster City, CA: IDG Books Worldwide, 1999.

MLA (9th ed.) Citation

Walnum, Clayton. Visual Basic 6 Master Reference. IDG Books Worldwide, 1999.